<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>函数式组件</title>
  </head>
  <body>
    <div id="test"></div>
    <script
      src="https://unpkg.com/react@16/umd/react.production.min.js"
      crossorigin
    ></script>
    <script
      src="https://unpkg.com/react-dom@16/umd/react-dom.production.min.js"
      crossorigin
    ></script>

    <script src="https://unpkg.com/babel-standalone@6/babel.min.js"></script>

    <script type="text/babel">
      //创建函数式组件
      function Demo() {
        console.log(this); //此处this 是undefined ,因为 badel 编译后 开启了严格模式
        return <h2>我是用函数定义的组件(简单组件)</h2>;
      }
      //渲染组件到页面
      ReactDOM.render(<Demo />, document.getElementById("test"));
    </script>
  </body>
</html>
